Ulmus davidiana var. japonica 'Discovery'
Ulmus davidiana var. japonica 'Discovery' | |
---|---|
Variety | Ulmus davidiana var. japonica |
Cultivar | 'Discovery' |
Origin | Canada |
The Japanese Elm cultivar Ulmus davidiana var. japonica 'Discovery' is a cold-resistant selection from Canada, raised along with 'Freedom' in the 1980s by Dr Wilbert Ronald, of Jeffries Nurseries Ltd. and Rick Durand of Shade Consulting Services, Portage la Prairie, Manitoba.
Description
Unlike other Japanese Elms, the growth habit of 'Discovery' is symmetrical, upright, and vase-shaped. The leaves are obovate to oval, and slightly smaller than is typical of the species, their colour dark green turning yellow in autumn.[1] The tree grows to over 15 m in height, with a spread of much the same dimension.
Pests and diseases
The tree is resistant to Dutch elm disease and elm leaf beetle Xanthogaleruca luteola.
Cultivation
'Discovery' performed very poorly in government trials [2] in Alberta, Canada, failing completely at five out of six sites. Moreover, the survivors developed a very poor branching pattern requiring pruning to strengthen crotches. 'Discovery' fared better in trials conducted by the University of Minnesota, which considered it "quite hardy", but the tree was criticized for its comparatively slow growth and need for continued crown thinning when young, the latter factor largely disqualifying it as a street tree.[2] Nonetheless, a number of trees have been established in the Minneapolis Parks system. The species does not sucker from roots. [3]
'Discovery' is not known to have been introduced to Europe or Australasia.
Accessions
North America
- Brenton Arboretum, Dallas Center, Iowa, US. No details available.
- Smith College, US. Acc. no. 4703.
Nurseries
North America
- Bailey Nurseries [3], St. Paul, Minnesota, US.
- Jeffries Nurseries [4], Portage la Prairie, Manitoba, Canada.
- Johnson's Nursery [5], Menomonee Falls, Wisconsin, US.
- Lee Nursery Inc. [6], Fertile, Minnesota, US.
- Linder's Garden Center [7], St. Paul, Minnesota|St. Paul, Minnesota, US.
- Minnesota Valley Nurseries [8], Shakopee, Minnesota, US.
- Patmore Nursery [9], Brandon, Manitoba, US.
- Robinson Nursery [10] Amity, Oregon, US.
- Sun Valley Garden Centre [11], Eden Prairie, Minnesota, US.
References
- ^ [1] Photographs of 'Discovery', Todd P. West, 'Elms: the Good, the Bad and the Ugly'; North Dakota State University Department of Plant Sciences; November 2022; p.25-26
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
- ^ Heybroek, Hans M. (1981). "The Japanese elm species and their value for the Dutch elm breeding program" (PDF). Proceedings of the Dutch Elm Disease symposium and workshop, October 5–9, Winnipeg, Manitoba: 78–90.
External links
- http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Return of the Elm -the status of elms in the nursery industry in 2000. Warren, K., J. Frank Schmidt and Co.
- v
- t
- e
- U. alata (Winged elm)
- U. americana (American elm)
- U. americana var. floridana (Florida elm)
- U. bergmanniana (Bergmann's elm)
- U. bergmanniana var. bergmanniana
- U. bergmanniana var. lasiophylla
- U. castaneifolia (Chestnut-leafed or multinerved elm)
- U. changii (Hangzhou elm)
- U. changii var. changii
- U. changii var. kunmingensis (Kunming elm)
- U. chenmoui (Chenmou or Langya Mountain elm)
- U. chumlia
- U. crassifolia (Cedar or Texas cedar elm)
- U. davidiana (David or Father David elm)
- U. davidiana var. davidiana
- U. davidiana var. japonica (Japanese elm)
- U. elongata (Long raceme elm)
- U. gaussenii (Anhui or hairy elm)
- U. glabra (Wych or scots elm)
- U. glaucescens (Gansu elm)
- U. glaucescens var. glaucescens
- U. glaucescens var. lasiocarpa (hairy-fruited glaucescent elm)
- U. harbinensis (Harbin elm)
- U. ismaelis
- U. laciniata (Manchurian cut-leaf or lobed elm)
- U. laciniata var. nikkoensis (Nikko elm)
- U. laevis (European white elm)
- U. laevis var. celtidea
- U. laevis var. parvifolia
- U. laevis var. simplicidens
- U. lamellosa (Hebei elm)
- U. lanceifolia (Vietnam elm)
- U. macrocarpa (Large-fruited elm)
- U. macrocarpa var. glabra
- U. macrocarpa var. macrocarpa
- U. mexicana (Mexican elm)
- U. microcarpa (Tibetan elm)
- U. minor (Field elm)
- U. minor subsp. minor
- U. minor var. italica
- U. parvifolia (Chinese or lacebark elm)
- U. parvifolia var. coreana (Korean elm)
- U. prunifolia (Cherry-leafed elm)
- U. pseudopropinqua (Harbin spring elm)
- U. pumila (Siberian elm)
- U. rubra (Slippery elm)
- U. serotina (September elm)
- U. szechuanica (Szechuan (Sichuan) or red-fruited elm)
- U. thomasii (Rock or cork elm)
- U. uyematsui (Alishan elm)
- U. villosa (Cherry-bark or marn elm)
- U. wallichiana (Himalayan or kashmir elm)
- U. wallichiana subsp. wallichiana
- U. wallichiana subsp. xanthoderma
- U. wallichiana var. tomentosa
- U. boissieri
- U. minor subsp. canescens (Grey, grey-leafed or hoary elm)
- U. elliptica
- U. davidiana var. japonica × U. minor
- U. × arbuscula
- U. × arkansana
- U. × brandisiana
- U. × diversifolia
- U. × hollandica (Dutch elm)
- U. × hollandica var. insularum
- U. × intermedia
- U. × mesocarpa
- aff. Plotii
- Acutifolia
- Alata
- Alksuth
- Argenteo-Marginata
- Aspera
- Atropurpurea
- Australis
- Berardii
- Betulaefolia Nigrescens
- Crispa
- Crispa Aurea
- Crispa Pendula
- Densa
- Exoniensis
- Fastigiata Glabra
- Folia Aurea
- Folia Rubra
- Folia Variegata Pendula
- Gallica
- Glabra
- Globosa
- Hamburg
- Hertfordensis Angustifolia
- Hertfordensis Latifolia
- Hillieri
- Jalaica
- Jacqueline Hillier
- Kansas Hybrid
- Klemmer Blanc
- Koopmannii
- Lombartsii
- Louis van Houtte
- Marmorata
- Monstrosa
- Myrtifolia
- Myrtifolia Purpurea
- Nemoralis
- Nigrescens
- Planeroides
- Planifolia
- Purpurea
- Pyramidalis Bertini
- Ramulosa
- Rotundifolia
- Rubra
- Rufa
- Rugosa
- Scampstoniensis
- Sericea
- Tiliaefolia
- Tortuosa
- Turkestanica
- Variegata Nova
- Virens
- U. okanaganensis